Imposter Syndrome

So a lot has happened. I'm dealing with terrible anxiety everyday and had to recently leave my last job to move to another state so I can avoid homelessness. I ended up staying with a roommate and eventually found another job but I feel like I have terrible imposter syndrome because I don't feel like im at all qualified to do this job. I'm a restaurant manager and mind you I have done jobs like this one before. I was a manager for 3 years before at my previous job but for some reason I am nervous all the time and am constantly screwing up at this current job even with the simplest tasks. I am constantly doubting myself and am just questioning my every move. I never wanted to take on another manager role. I just wanted a job that doesn't require any leadership but my boss has kinda pressured me Into stepping into this kind of position and idk what to do. I do need the job but I want to step down and just be a simple crew member. Any advice on whether I should tell my boss how I feel? I don't want to get fired.